Re: [CentOS] forcing linux kernel 3 to recognize cdrom as hdX
On Thu, Aug 8, 2013 at 8:39 PM, Oguz Yilmaz oguzyilmazl...@gmail.comwrote: Hello, I have a problem with older version of anaconda linux installer. I have upgraded kernel in my distro, but, when this anaconda boot with new 3.4.52 kernel, can NOT find cdrom. As far as I understand, this is because the new kernel recognize cd drive as srX, scdX instead of older hdX with 2.6.18. At the moment I can not upgrade anaconda and forced this kernel to recognize it as before. Are there any kernel command line argument, kernel config or something else for kernel 3.4.52 to recognize this cdrom as hdX? Best Regards, -- Oguz YILMAZ I think you need to write some udev rules to name the device differently. Refer to the following: https://www.kernel.org/pub/linux/utils/kernel/hotplug/udev/udev.html http://www.linuxforu.com/2012/06/some-nifty-udev-rules-and-examples/ http://www.reactivated.net/writing_udev_rules.html HTH, -- Manish Kathuria ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] forcing linux kernel 3 to recognize cdrom as hdX
On Thu, Aug 8, 2013 at 9:03 PM, Oguz Yilmaz oguzyilmazl...@gmail.comwrote: Actually I have tried lots of things. As far as I see, this is not as simple as a symlink. Anaconda C application find CDROM according to some info provided by kernel. Also, Anaconda stage1 has a very limited debug option. I have possibilities to recompile kernel with some options or run kickstart with some kernel arguments. My original problem can be found at the following mailing list thread: http://article.gmane.org/gmane.linux.redhat.kickstart.general/9616/match=%5D -- Oguz YILMAZ On Thu, Aug 8, 2013 at 6:23 PM, Manish Kathuria mkathu...@tuxtechnologies.co.in wrote: On Thu, Aug 8, 2013 at 8:39 PM, Oguz Yilmaz oguzyilmazl...@gmail.com wrote: Hello, I have a problem with older version of anaconda linux installer. I have upgraded kernel in my distro, but, when this anaconda boot with new 3.4.52 kernel, can NOT find cdrom. As far as I understand, this is because the new kernel recognize cd drive as srX, scdX instead of older hdX with 2.6.18. At the moment I can not upgrade anaconda and forced this kernel to recognize it as before. Are there any kernel command line argument, kernel config or something else for kernel 3.4.52 to recognize this cdrom as hdX? Best Regards, -- Oguz YILMAZ I think you need to write some udev rules to name the device differently. Refer to the following: https://www.kernel.org/pub/linux/utils/kernel/hotplug/udev/udev.html http://www.linuxforu.com/2012/06/some-nifty-udev-rules-and-examples/ http://www.reactivated.net/writing_udev_rules.html HTH, -- Manish Kathuria If you have references to cdrom in your kickstart file, as you have mentioned in that forum, try to change them to match the device name being assigned by the kernel. -- Manish Kathuria ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] www.centos.org is down
On Tue, Jun 25, 2013 at 7:40 PM, Scott Robbins scot...@nyc.rr.com wrote: On Tue, Jun 25, 2013 at 08:23:01AM -0500, Blake Hudson wrote: Looks like Apache is not running... Working from NYC. -- Accessible from Delhi too. -- Manish Kathuria ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] check file changes within several directories
On Wed, Feb 13, 2013 at 4:43 PM, Laurent Wandrebeck l.wandreb...@gmail.comwrote: On Wed, 13 Feb 2013 14:08:47 +0300 Mihamina Rakotomandimby miham...@rktmb.org wrote: Hi all, I forgot the name a sofware (I think it was something related to security) wich checks for file content/permission changes, on a cron trigger basis. I could then have the list of added/changed files. I dont want to use some selfmade git-based or find|xargs-based piece of scripts. I bet you're searching for aide, base repo. HTH, Laurent. Or Tripwire. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Linux Software RAID 1 - Unequal Sized Hard Disks
Has anyone created or rebuilt a Linux Software RAID having mirrored partitions on unequal sized hard disks ? There is a CentOS 5 server having two 400 GB hard disks with five mirrored partitions (software RAID 1) and one of the hard disks is dying. Since new 400 GB HDDs are not available here, we are exploring the possibility of replacing the faulty hard disk with one of a higher capacity (500 GB or more). And once it is fully replicated, we plan to replace the other 400 GB HDD also with another hard disk of the same higher capacity. Just want to know if anyone has done something similar and what are the chances of success (or data loss) ? Thanks, -- Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] list of websites visited through centos
On Thu, Oct 18, 2012 at 7:59 PM, Mike Burger mbur...@bubbanfriends.org wrote: On 10/16/2012 09:08 AM, Chaitanya Yanamadala wrote: Hai i have installed a new centos server and i am planning to use this machine as my gateway and restrict the usage of the certain websites. So i guess basically i am trying to use this machine as my firewall. So could any one guide me on this. How to achieve this. Take a look at squid proxy server (http://www.squid-cache.org/) and squidguard (http://www.squidguard.org/). Both are available in the CentOS repositories. Dansguardian is pretty good, as well, and also works in conjunction with Squid. -- Mike Burger http://www.bubbanfriends.org And you can also use calamaris, sarg or lightsquid for tracking the web usage. -- Manish Kathuria Tux Technologies http://www.tuxtechnologies.co.in/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Linux Software RAID 1 - Unequal Sized Hard Disks
On Thu, Oct 18, 2012 at 9:02 PM, Reindl Harald h.rei...@thelounge.net wrote: Am 18.10.2012 17:29, schrieb Manish Kathuria: Has anyone created or rebuilt a Linux Software RAID having mirrored partitions on unequal sized hard disks ? There is a CentOS 5 server having two 400 GB hard disks with five mirrored partitions (software RAID 1) and one of the hard disks is dying. Since new 400 GB HDDs are not available here, we are exploring the possibility of replacing the faulty hard disk with one of a higher capacity (500 GB or more). And once it is fully replicated, we plan to replace the other 400 GB HDD also with another hard disk of the same higher capacity. Just want to know if anyone has done something similar and what are the chances of success (or data loss) ? no problem at all * remove the disk * dd if=/dev/one-of-the-living/ of=/dev/new-disk/ bs=512 count=1 * reboot or bring the kernel to re-read the partition table * rebuild the raid the dd-trick is intented to clone the complete partition table and MBR to the new disk and the additional space is untouched linux-software raid has no problem with different disk-sizes only the used partitions must be equal Thanks Reindl, copying the first sector using is the simplest and foolproof way of ensuring that the exact partition table is cloned but would it also include the logical partitions ? In our case we have 5 partitions, two of which are logical ones. -- Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Linux Software RAID 1 - Unequal Sized Hard Disks
On Thu, Oct 18, 2012 at 9:25 PM, Bowie Bailey bowie_bai...@buc.com wrote: On 10/18/2012 11:29 AM, Manish Kathuria wrote: Has anyone created or rebuilt a Linux Software RAID having mirrored partitions on unequal sized hard disks ? There is a CentOS 5 server having two 400 GB hard disks with five mirrored partitions (software RAID 1) and one of the hard disks is dying. Since new 400 GB HDDs are not available here, we are exploring the possibility of replacing the faulty hard disk with one of a higher capacity (500 GB or more). And once it is fully replicated, we plan to replace the other 400 GB HDD also with another hard disk of the same higher capacity. Just want to know if anyone has done something similar and what are the chances of success (or data loss) ? I've done this with a 3-drive software raid 1. It originally had 750GB drives which I replaced with 1TB drives. Swapped them out one by one configuring them with the exact same partition structure as the others and allowing each one to resync before continuing. Once they were all in, I resized the filesystem (ext3) to take advantage of the extra space. -- Bowie That sounds perfect. Did you create the new partitions manually using fdisk / sfdisk ? I guess that can take care of the logical partitions. Thanks, -- Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Routing issue
The routes-x.y-z.diff is a unified patch containing different parts which include support for Dead Gateway Detection as well. However, since that is limited to the first hop, it is preferable to have a userspace script as you are doing. I also use a script to check the accessibility of a remote popular site from each of the ISPs and based upon the response the links are treated alive or dead and the default gateway is changed. However, the routing problem as described by you will only be solved after applying this patch (routes-x.y-z.diff). As for marking the incoming packets to ensure that they go out from the same interface they came from, you could do something like the following: Using iptables mark the incoming traffic from external interfaces /sbin/iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark /sbin/iptables -t mangle -A OUTPUT -j CONNMARK --restore-mark /sbin/iptables -t mangle -A PREROUTING -i eth1 -j MARK --set-mark 1 /sbin/iptables -t mangle -A PREROUTING -i eth1 -j CONNMARK --save-mark /sbin/iptables -t mangle -A PREROUTING -i eth2 -j MARK --set-mark 2 /sbin/iptables -t mangle -A PREROUTING -i eth2 -j CONNMARK --save-mark Add the following rules to your existing ones for policy routing /sbin/ip rule add fwmark 1 table T1 /sbin/ip rule add fwmark 2 table T2 Hi Manish, Thanks for the info. The one question I have is about /sbin/iptables -t mangle -A OUTPUT -j CONNMARK --restore-mark I thought the OUTPUT chain was only for packets originating locally. I am only concerned with clients behind my Linux router, do I still need this? Yes you are right but in case if you have any services running on the linux router itself (for example sshd) and accessible from the internet, it would help. Hi Manish, The above rules appear to be for clients coming into the router from external. They don't solve the problem for clients inside the router going out thru the load balanced interfaces. I have done much googling and testing without much luck. At this point in time I would be satisfied with just being able to have a client inside the router do FTP over just one of the outbound interfaces without any load balancing for FTP. I have this working but only for active mode FTP by using the following: /sbin/iptables -t mangle -A PREROUTING -p tcp --dport 20:21 -j MARK --set-mark 1 But it doesn't work for passive because you don't know what ports are going to be used. Regards, -- Stephen Clark I was under the impression that you are running a FTP server inside and were facing problems with the incoming traffic for the same. If you are primarily concerned with the outgoing traffic through two ISP links, please follow the following steps: 1. Refer to http://www.ssi.bg/~ja/nano.txt for creating your rules. 2. Recompile the kernel after applying Julian Anistov's routes patch (the URL is there in the earlier messages). 3. Make a script to check the status of the links and change the default gateway accordingly. Let me know if you need a script. 4. Make sure that your firewall (iptables) is stateful and allows related and established connections and the NAT and connection tracking modules (nf_conntrack, nf_conntrack_ftp, nf_nat and nf_nat_ftp) are loaded. I have followed this approach at a number of places without any problems related to FTP or other protocols. The only issue I faced was that the patch failed for all the CentOS 5.x kernels I tried (perhaps due to some conflict with an existing patch). But its working perfectly for the kernels in CentOS 6 and 6.1. Thanks, -- Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Routing issue
On Wed, Oct 3, 2012 at 7:00 PM, Steve Clark scl...@netwolves.com wrote: On 10/03/2012 08:46 AM, Manish Kathuria wrote: I was under the impression that you are running a FTP server inside and were facing problems with the incoming traffic for the same. If you are primarily concerned with the outgoing traffic through two ISP links, please follow the following steps: 1. Refer to http://www.ssi.bg/~ja/nano.txt for creating your rules. 2. Recompile the kernel after applying Julian Anistov's routes patch (the URL is there in the earlier messages). 3. Make a script to check the status of the links and change the default gateway accordingly. Let me know if you need a script. 4. Make sure that your firewall (iptables) is stateful and allows related and established connections and the NAT and connection tracking modules (nf_conntrack, nf_conntrack_ftp, nf_nat and nf_nat_ftp) are loaded. I have followed this approach at a number of places without any problems related to FTP or other protocols. The only issue I faced was that the patch failed for all the CentOS 5.x kernels I tried (perhaps due to some conflict with an existing patch). But its working perfectly for the kernels in CentOS 6 and 6.1. Thanks, -- Manish Hi Manish, Thanks for the response. It is good to know there is a general solution. It is too bad that the referenced patches were never merged into to main kernel tree, forcing people to have to build and maintain their own kernel. -- Stephen Clark In case you want to avoid compiling the kernel and are comfortable with FreeBSD, try pfSense, it also offers outbound load balancing and failover for multiple WAN links. -- Manish Kathuria ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Routing issue
On Thu, Sep 27, 2012 at 7:04 PM, Steve Clark scl...@netwolves.com wrote: On 09/26/2012 11:57 PM, Manish Kathuria wrote: On Thu, Sep 27, 2012 at 7:46 AM, Gordon Messmer yiny...@eburg.com wrote: On 09/26/2012 09:15 AM, Steve Clark wrote: Is there a way to make this work correctly? In addition, you should ideally applying the following patches for Static, Alternative Routes, Dead Gateway Detection NAT and recompile the kernel: http://www.ssi.bg/~ja/#routes Hmmm... not being a kernel guru, correct me if I am wrong but isn't the route patch used to detect dead nexthops? I am already doing that from userspace. The second set looks like is calls the routing logic after the SNAT, is that correct? This could solve the problem. Why aren't these patches in the kernel? Thanks, The routes-x.y-z.diff is a unified patch containing different parts which include support for Dead Gateway Detection as well. However, since that is limited to the first hop, it is preferable to have a userspace script as you are doing. I also use a script to check the accessibility of a remote popular site from each of the ISPs and based upon the response the links are treated alive or dead and the default gateway is changed. However, the routing problem as described by you will only be solved after applying this patch (routes-x.y-z.diff). As for marking the incoming packets to ensure that they go out from the same interface they came from, you could do something like the following: Using iptables mark the incoming traffic from external interfaces /sbin/iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark /sbin/iptables -t mangle -A OUTPUT -j CONNMARK --restore-mark /sbin/iptables -t mangle -A PREROUTING -i eth1 -j MARK --set-mark 1 /sbin/iptables -t mangle -A PREROUTING -i eth1 -j CONNMARK --save-mark /sbin/iptables -t mangle -A PREROUTING -i eth2 -j MARK --set-mark 2 /sbin/iptables -t mangle -A PREROUTING -i eth2 -j CONNMARK --save-mark Add the following rules to your existing ones for policy routing /sbin/ip rule add fwmark 1 table T1 /sbin/ip rule add fwmark 2 table T2 Thanks, -- Manish Kathuria ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Routing issue
On Thu, Sep 27, 2012 at 8:55 PM, Steve Clark scl...@netwolves.com wrote: On 09/27/2012 11:01 AM, Manish Kathuria wrote: On Thu, Sep 27, 2012 at 7:04 PM, Steve Clark scl...@netwolves.com wrote: On 09/26/2012 11:57 PM, Manish Kathuria wrote: On Thu, Sep 27, 2012 at 7:46 AM, Gordon Messmer yiny...@eburg.com wrote: On 09/26/2012 09:15 AM, Steve Clark wrote: The routes-x.y-z.diff is a unified patch containing different parts which include support for Dead Gateway Detection as well. However, since that is limited to the first hop, it is preferable to have a userspace script as you are doing. I also use a script to check the accessibility of a remote popular site from each of the ISPs and based upon the response the links are treated alive or dead and the default gateway is changed. However, the routing problem as described by you will only be solved after applying this patch (routes-x.y-z.diff). As for marking the incoming packets to ensure that they go out from the same interface they came from, you could do something like the following: Using iptables mark the incoming traffic from external interfaces /sbin/iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark /sbin/iptables -t mangle -A OUTPUT -j CONNMARK --restore-mark /sbin/iptables -t mangle -A PREROUTING -i eth1 -j MARK --set-mark 1 /sbin/iptables -t mangle -A PREROUTING -i eth1 -j CONNMARK --save-mark /sbin/iptables -t mangle -A PREROUTING -i eth2 -j MARK --set-mark 2 /sbin/iptables -t mangle -A PREROUTING -i eth2 -j CONNMARK --save-mark Add the following rules to your existing ones for policy routing /sbin/ip rule add fwmark 1 table T1 /sbin/ip rule add fwmark 2 table T2 Hi Manish, Thanks for the info. The one question I have is about /sbin/iptables -t mangle -A OUTPUT -j CONNMARK --restore-mark I thought the OUTPUT chain was only for packets originating locally. I am only concerned with clients behind my Linux router, do I still need this? Yes you are right but in case if you have any services running on the linux router itself (for example sshd) and accessible from the internet, it would help. Again, thanks much for responding. -- Stephen Clark NetWolves Director of Technology Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.cl...@netwolves.com http://www.netwolves.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Routing issue
On Thu, Sep 27, 2012 at 7:46 AM, Gordon Messmer yiny...@eburg.com wrote: On 09/26/2012 09:15 AM, Steve Clark wrote: Is there a way to make this work correctly? Shorewall will generate a proper configuration if you specify the track option in the providers file. It might be a good idea to use that to generate your configs rather than building them by hand. I believe that you need to mark your connections and use the marks to select the routing table, in addition to using the from rules that you posted. Otherwise, nothing binds the connection to a fixed route/interface in a load balanced configuration. In addition, you should ideally applying the following patches for Static, Alternative Routes, Dead Gateway Detection NAT and recompile the kernel: http://www.ssi.bg/~ja/#routes Thanks, -- Manish Kathuria ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Wireless Interface Does Not Connect Automatically At StartUp
I have recently installed CentOS 6 on a system with a Realtek 8180L wireless card. The wireless card is detected properly and uses the rtl8180 driver. But it connects to our wireless network only after logging to the Desktop Environment (GNOME) and using the Network Manager Applet. In order to make the wireless card connect to the network automatically at system start up, I edited the Connection using the Network Manager Applet and checked Connect Automatically and Available to all users options. However, while booting the system, the following error message is displayed when the wireless network interface is brought up. Device does not seem to be present, delaying initialization But as soon as a user logs on to the Desktop, he can connect to the network using the NM Applet. I have also toggled between using DHCP and Static IP Address for the the wireless card but it makes no difference. The SSID is not being broadcast and the Wireless Access Point / Router uses WPA-PSK. TIA, -- Manish Kathuria ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Wireless Interface Does Not Connect Automatically At StartUp
On Mon, Jul 18, 2011 at 11:06 PM, Cody Jackson supertanke...@gmail.com wrote: Hi Manish; I've never tried NM during boot. (Personally, I dislike NM at all.) You might find a system similar to this to be more of your liking: http://wiki.centos.org/HowTos/Laptops/WpaSupplicant I use this in place of my CentOS 6 backup server, which has an rt2500pci card in it--which, by the way, is a horrible shoddy card that I do not recommend. It doesn't play nice with Netgear APs. But I digress. CentOS 6 appears to have made some changes to the above document. What I've discovered is: 1. You don't need to edit ifup-wireless. 2. You don't need to edit ifconfig-* (although one should be created--I can post mine if it'll help you.) 3. All you need in /etc/rc.local is an 'ifup wlan0' line. 4. You DO need to edit /etc/sysconfig/wpa_supplicant and add the interface of your wireless card to the options there (example: -iwlan0). 5. wpa_supplicant should be ENABLED on boot. Cheers, Cody Jackson On 7/18/11, Manish Kathuria mkathu...@tuxtechnologies.co.in wrote: I have recently installed CentOS 6 on a system with a Realtek 8180L wireless card. The wireless card is detected properly and uses the rtl8180 driver. But it connects to our wireless network only after logging to the Desktop Environment (GNOME) and using the Network Manager Applet. In order to make the wireless card connect to the network automatically at system start up, I edited the Connection using the Network Manager Applet and checked Connect Automatically and Available to all users options. However, while booting the system, the following error message is displayed when the wireless network interface is brought up. Device does not seem to be present, delaying initialization But as soon as a user logs on to the Desktop, he can connect to the network using the NM Applet. I have also toggled between using DHCP and Static IP Address for the the wireless card but it makes no difference. The SSID is not being broadcast and the Wireless Access Point / Router uses WPA-PSK. -- Manish Kathuria Thanks for the tip. While searching for a solution, I also read about wicd (http://wicd.sourceforge.net/) which can help, but will try wpa_supplicant first since its a part of the distro. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Mount Point Ownership Group
I am facing problems assigning the owner and group to an ext3 filesystem being mounted from an external storage. I created a mount point /vol and changed its owner and group to alpha and beta respectively (as required). The ext3 filesystem (LV from the external storage) was then mounted on /vol using the mount command. However, after mounting the filesystem the owner and group of /vol changed back to root. How do I ensure that the owner and group for this (and other) external filesystem to be mounted dynamically are preserved as required ? The mount options uid and gid don't seem to work for ext3 filesystems. Are there any other options for this purpose? Thanks, Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] yum list updates error (Manish Kathuria)
On Mon, Oct 18, 2010 at 3:22 PM, Ritika Garg ritikagar...@gmail.com wrote: There was no proxy in the file /etc/yum.conf. I specified the proxy setting and now yum list updates is working. A part of the output was: Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: centos.01link.hk * updates: centos.01link.hk * addons: centos.01link.hk * extras: centos.01link.hk Updated Packages ImageMagick.i386 6.2.8.0-4.el5_5.2 updates ImageMagick.x86_64 6.2.8.0-4.el5_5.2 updates NetworkManager.i386 1:0.7.0-10.el5_5.1 updates Its written Updated Packages. Does this mean it has already updated? I thought that this command displays packages that need to be updated. Updated Packages here means the list of the packages installed on your system having updated versions available in the configured repositories. The tabular listing would have the name of the package, the latest version available in the repository and the name of that repository. -- Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Password Expiry
Hello, Is there any command / option available on CentOS to expire a user's password immediately ? I remember using passwd -e on some other distribution but the -e option does not seem to be present on CentOS 5.x. Thanks, Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Password Expiry
On Mon, Oct 18, 2010 at 10:21 PM, Scott Robbins scot...@nyc.rr.com wrote: On Mon, Oct 18, 2010 at 09:42:59PM +0530, Manish Kathuria wrote: Is there any command / option available on CentOS to expire a user's password immediately ? I remember using passwd -e on some other distribution but the -e option does not seem to be present on CentOS 5.x. If you want to make them change their password right now chage -d 0 username Which gives a message Password: You are required to change your password immediately (root enforced) Changing password for test2 (current) UNIX password: -- Scott Robbins Thanks, this is precisely what I was looking for. Thank you Eero too. -- Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] yum list updates error
On Sat, Oct 16, 2010 at 12:21 PM, Ritika Garg ritikagar...@gmail.com wrote: Before doing yum update on system which has CentOS5.3, I gave yum list updates but the following message comes: Loaded plugins: fastestmirror Determining fastest mirrors Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=5arch=x86_64repo=os error was [Errno 4] IOError: urlopen error (110, 'Connection timed out') Error: Cannot find a valid baseurl for repo: base Check whether the system has internet connectivity, verify if the nameservers have been listed in /etc/resolv.conf and if the system connects to the net through a proxy server, specify proxy settings in /etc/yum.conf. These could be the basic reasons for this error to appear. -- Manish Kathuria ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] GUID Partition Tables and Ext3 Partition Size
Hello, Does CentOS 5.4 support large ( 2 TB) external storage devices using GPT (GUID Partition Tables), while the main OS resides on smaller hard disks using MBR. In this scenario, what can be the largest possible size of an ext3 partition (and filesystem) which can be created on the storage array under CentOS 5.4 ? Thanks, Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] GUID Partition Tables and Ext3 Partition Size
On Mon, Nov 9, 2009 at 10:26 AM, Phil Manuel p...@zomojo.com wrote: This might help http://en.wikipedia.org/wiki/GUID_Partition_Table We certainly have a GPT partition of 15Tb but I know it can go much larger. Phil. Thanks Phil. I had seen that site before and I wanted to know the status on the current CentOS kernels. Are you running CentOS 5.x and using LVM for this partition or have you formatted it as ext3 filesystem directly ? -- Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] sendmail and spam
On Wed, 2008-06-04 at 16:53 -0400, Alain Terriault wrote: Hi, What is todays most effective combination to filter spam ? On my old Redhat 3 system I used Sendmail and Spamassasin .. it was good, but with the current setup we are getting way to much spam. Looking around I found new players, well some I did not know then and they are very interesting.. MailScanner .. http://www.mailscanner.info/ Sagator .. http://www.salstar.sk/sagator/ Smf .. http://smfs.sourceforge.net/index.html dspam .. http://dspam.nuclearelephant.com/index.shtml I am tempted to go with smfs because it is familiar .. but, mailscanner seems popular thanks, alain I would recommend using Postfix along with Amavisd-new which in turn would invoke Spamassassin for spam filtering. You can also use an anti virus program like Clam AV with it to filter for viruses also. I have experienced excellent performance using this combination with lesser utilization of system resources as compared to sendmail. As suggested by many others, you must also configure a couple of RBLs which will actually reject a major part of the incoming spam / junk mail and leave very little for subsequent filtering. -- Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] /etc/resolv.conf - Number of Nameservers
On Sun, 2008-03-09 at 22:02 -0700, John R Pierce wrote: Manish Kathuria wrote: What is the maximum number of nameservers mentioned in /etc/resolv.conf which will be queried while looking up a hostname or IP address in the present version ? Earlier implementations had a ceiling of 3 name servers which could be queried. Has there been any increase ? only one server is ever queried. only if it if it can't be reached at all will it fall back on the 2nd one (and if that can't be reached, the 3rd) a answer of 'host not found' from the primary server does /not/ trigger any fallback, instead it returns not found. so, why would you need more than 3 ? DNS servers should have a . uptime. The idea is to switch between multiple internet links for the same internal network, without making frequent changes to /etc/resolv.conf. The ISPs here don't allow DNS look ups from an IP not belong to their address, so a number of look up requests get denied when the outgoing connection is through another ISP. Of course, I can run a caching nameserver on the small network or use Open DNS servers but that adds to the delay. Thank you, Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] /etc/resolv.conf - Number of Nameservers
What is the maximum number of nameservers mentioned in /etc/resolv.conf which will be queried while looking up a hostname or IP address in the present version ? Earlier implementations had a ceiling of 3 name servers which could be queried. Has there been any increase ? Thanks, Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] RHEL / CentOS Kernel Updates
On 1/30/08, Johnny Hughes [EMAIL PROTECTED] wrote: nate wrote: Manish Kathuria wrote: New features are typically not backported to current versions of the kernel, newer drivers are often back ported, assuming the driver existed in the RHEL kernel. If the driver did not exist then it's much less likely to get included. For the lifetime of a distribution like RHEL 4 or RHEL 5, Red Hat would stick to the same major and minor number of the kernel and would just change release numbers. What is the relation, if any, between the new kernels and the updates released by Red Hat ? They make their systems ABI compatible throughout the lifetime of the major version(4.x, 5.x). If your looking to stay on the leading edge with kernel updates your best off using another distro maybe Fedora or something. If your looking for a stable system that you don't have to worry about even if it means you have to be more careful about picking what hardware you run it on, RHEL and CentOS are good choices. You can always build your own kernels on RHEL/CentOS if you wanted, or rebuild Fedora kernels and install them on RHEL/CentOS, in most cases it should work. All the rest of what you said is true though ... drivers get backported much more frequently than other features. In this connection, I have an example. I have a Netgear WG111 v2 USB Wireless Adapter which does not get detected by CentOS 5.1 updated with the latest 2.6.18 kernel released. This particular adapter has the Realtek 8187 chip. However, Fedora 8 running on 2.6.23 detects the adapter and also loads the correct module for it. This leaves me wondering whether the adapter will ever be supported by the current Cent OS 5.x kernel or the subsequent updates. Thanks, -- Manish Kathuria ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Difficulty with 5.0 - 5.1 upgrade: sysreport vs. sos
On 12/3/07, Bart Schaefer [EMAIL PROTECTED] wrote: I got file conflicts between the sysreport and sos packages on the file /usr/sbin/sysreport. I unchecked sysreport in the package updater UI and the rest of the update is proceedng. ___ Sosreport is the package replacing sysreport. You can manually remove sysreport using rpm -e and then install sos report using yum. -- Manish Kathuria Tux Technologies http://www.tuxtechnologies.co.in/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] how to Load balancing
On 11/22/07, D. Bettancourt M. [EMAIL PROTECTED] wrote: Hi I need informmation about this Topic: Load balancing,, I have 2 nic to internet, 1 nic to DMZ, and 1 nic to LAN, but I don,t know how do that. Where I can found information ?? If you haven't found a solution yet, check out http://www.lartc.org/ . -- Manish Kathuria Tux Technologies http://www.tuxtechnologies.co.in/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] x86_64 versus i386
Hello, On the Intel Core 2 Duo processor based systems, we have the option of installing either x86_64 or the i386 distribution. I would like to know your experiences with the x86_64 port. How does it compare with the i386 distribution in terms of stability, reliability and performance ? How significant are the performance benefits gained by using the x86_64 linux instead of i386 on the same system ? Keeping in mind a production environment, which port of CentOS do you recommend for a Core 2 Duo based server ? It would be great to have your opinion. Thanks, Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] x86_64 versus i386
On 12/3/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: - Original Message - From: Manish Kathuria [EMAIL PROTECTED] Hello, On the Intel Core 2 Duo processor based systems, we have the option of installing either x86_64 or the i386 distribution. I would like to know your experiences with the x86_64 port. How does it compare with the i386 distribution in terms of stability, reliability and performance ? How significant are the performance benefits gained by using the x86_64 linux instead of i386 on the same system ? Keeping in mind a production environment, which port of CentOS do you recommend for a Core 2 Duo based server ? It would be great to have your opinion. Thanks, Manish For me it comes down to 2 things; 1) what are you going to use the server for ? Typical uses like a mail server running sendmail / postfix along with amavis and spamassassin, a proxy server and a mysql database on different systems. 2) how much ram do you have ? a maximum of 2 GB. If these answers include database, webserver and/or 4gb of RAM then I'd definately go 64bit. From what I've seen these are the main areas where 64bit will benefit you. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] GFS-kernel module - Version Magic Error
Are the RPMs for the latest GFS kernel module GFS-kernel-2.6.9-72.2.0.8 to be used with the version 2.6.9-55.0.9.EL available ? I tried to compile the Source RPMs available from the Red Hat site but the modules can't be loaded because of invalid module format arising from version magic issues. The syslog shows: node0 kernel: gfs: version magic '2.6.9-55.0.9.ELsmp SMP 686 REGPARM 4KSTACKS gcc-3.2' should be '2.6.9-55.0.9.ELsmp SMP 686 REGPARM 4KSTACKS gcc-3.4' node0 modprobe: FATAL: Error inserting gfs (/lib/modules/2.6.9-55.0.9.ELsmp/kernel/fs/gfs/gfs.ko): Invalid module format The error message is actually surprising since the Source RPM has been compiled on a system having gcc-3.4. To complicate matters the modinfo indicates vermagic: 2.6.9-55.0.9.ELsmp SMP 686 REGPARM 4KSTACKS gcc-3.2 When are the CentOS builds expected for this module ? Thanks, Manish ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
